Stimulative Effect of High-level Hypergravity on Differentiated Functions of Osteoblast-like Cells

Cell Structure and Function

Hiroyoshi Endo¹  Rie Shibata¹  Kohtaro Kawashima¹  Yoichi Negishi¹ 

[1] Department of Physiological Chemistry, Faculty of Pharmaceutical Sciences, Teikyo University

关键词: mechanical stress;    hypergravity;    osteoblasts;    alkaline phosphatase;    osteocalcin;    cAMP;   

DOI  :  10.1247/csf.23.221

学科分类：分子生物学，细胞生物学和基因

来源: Japan Society for Cell Biology

【 摘 要 】

References(35)Cited-By(6)The exposure of freshly isolated osteoblasts and osteoblast-like cells to high-level hypergravity caused the inhibition of cell growth, elevation of cAMP content, and the stimulation of differentiated functions such as alkaline phosphatase activity, collagen synthesis, and osteocalcin synthesis. Blockage of elevation of cAMP by SQ22536, an inhibitor of adenylate cyclase, resulted in the inhibition of the hypergravity-stimulated alkaline phosphatase activity, indicating that cAMP is the intracellular mediator of this action of hypergravity. H89, an inhibitor of cAMP-dependent protein kinase (PKA), further inhibited the cell growth that was already inhibited by the hypergravity, and further stimulated the alkaline phosphatase activity that was already stimulated by hypergravity. If cAMP acts through the PKA system, H89 should have blocked the changes in cell function effected by the exposure to hypergravity. Therefore the elevated intracellular cAMP by the exposure of hypergravity caused the changes in cell function by a PKA-independent pathway.

【 授权许可】

Unknown